I was struggling a bit with the answers given here, so maybe the following additional details might help others like me who have no prior experience with the sysrq key and would like to give it a try:
According to the manual, on my W510 the sysrq key is
Fn + PrintScreen. (Googling
Thinkpad <your Thinkpad model> manual should get you the manual. Then, search for
sysrq in the manual itself.)
Finally, the magic sysrq key combinations can be reached through:
- Hold down
- Hold down
PrintScreen for a moment and then release the two keys again. (They basically act as one key.) Meanwhile, keep holding down
- Hit the remaining key of the magic sysrq key combination you would like to use (e.g.
h for help or
b for reboot).
Side note 1: For ergonomic reasons I had swapped the
Ctrl keys in my Thinkpad's BIOS (as is possible with practically any Thinkpad), so in my case I actually have to hit the left
Ctrl key whenever I want to use the
Fn key. In case of the sysrq key this is no different!
Side note 2: Whenever the table on Wikipedia says a key combination will "display" certain information, what is meant is that the information is going to be written to the system log, which can be accessed through e.g.
$ dmesg or
$ less /var/log/syslog. At the same time, if you're logged in on any TTY (
Ctrl + Alt + F[1-6]), then the same information will also be displayed there. Similarly, the kernel will respond with a message in the logs if a certain sysrq operation you're trying to use is disabled.
Side note 3: On Ubuntu there's a file
/etc/sysctl.d/10-magic-sysrq.conf controlling which magic sysrq key chords are available/enabled and which aren't.